package com.test.collec;

import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;

public class ListDemo {
    public static void main(String[] args) {
        //List<String> list = new ArrayList<>(); //java.util.ConcurrentModificationException
        //List<String> list = new Vector<>(); // add 添加了Sync
       // List<String> list = Collections.synchronizedList(new ArrayList<>());
        List<String> list = new CopyOnWriteArrayList<>();
        for (int i = 0; i < 100; i++) {
            new Thread(()->{
                list.add(UUID.randomUUID().toString().substring(1,8));
                System.out.println(list);
            },String.valueOf(i)).start();
        }
//        list.forEach(System.out::println);
    }
}
